TWI387395B - Light emitting diode drive architecture - Google Patents

Abstract

The present invention discloses an LED driving structure, which obtains an input power and converts the same into a driving power to drive a plurality of LEDs. The driving structure comprises: a plurality of diode groups connected in parallel, a first piezoelectric conversion unit and a second piezoelectric conversion unit respectively connected with the two sides of the diode groups. The first and second piezoelectric conversion units receive the input power and convert the input power into driving powers in opposite time sequence for driving the diode groups. Among the plurality of diode groups, at least one diode group is formed of a plurality of LEDs. Each of the first and second piezoelectric conversion units has a piezoelectric inverter, which can easily achieve an impedance matching and a constant-current power and use the constant-current power to drive LEDs via a piezoelectric effect. In addition, the present invention also has the efficacy of saving cost.

Description

LED driving architecture

A light-emitting diode driving structure is a circuit structure in which a transformer unit cooperates with a push-pull driving circuit to generate driving power, thereby driving a group of light-emitting diodes.

Light-emitting diodes have many advantages such as high luminous efficiency, long life, small size, and low power consumption. After the development of a variety of different color LEDs, a large number of existing light sources are replaced, and they are commonly used in various types of illumination and display. Technically, and has become the focus of many semiconductor companies to develop; and the LEDs are similar in circuit characteristics to the general diodes, which can also be divided into forward biases that can easily pass current and almost no reverse currents. The bias voltage, and only the forward bias, allows the light-emitting diode to emit light. Therefore, the alternating current can only use the positive half cycle of the current to operate the light-emitting diode, and the reverse breakdown voltage of the light-emitting diode is generally rated. The value is generally low, and the negative half cycle of the alternating current is extremely easy to break through the light-emitting diode to cause permanent damage. Therefore, a special driving circuit is required to supply power to the light-emitting diode, and a preferred method is to drive the light-emitting diode. The basic driving circuit, such as the "Light Emitting Diode Light Control Device" of the Republic of China Patent Certificate No. M298538, provides a boost rectifier circuit in the prior art. a driving IC and a light string having a plurality of light emitting diodes, the boosting and rectifying circuit being controlled by the driving IC to determine the current to be turned on to the light string. However, the light string disclosed in the creation is in the same direction. Connecting the LEDs in series, and using a driving IC to provide a control pulse, the boosting rectifier circuit performs a switching boost, and the current supplied by the boosting rectifier circuit has a fluctuating current, so that the current has a higher point At a lower point, the current will generate a critical conduction time that is insufficient to turn on the LED before reaching a higher point. In addition, the driving circuit needs another circuit to generate a constant voltage required for driving, and the driving IC makes The cost increases, so the problems of the creation have the disadvantages of high cost and driving effect to be strengthened; another type of creation is the "light source circuit, transformer circuit, light-emitting panel and balanced current method" of the Republic of China Patent Certificate No. I273536. The creation of the drawing shows that the creation provides a plurality of balanced AC power through a plurality of sets of balance transformers in a balance transformer circuit, and The full-wave rectification circuit converts the AC power into fluctuating DC power to drive multiple sets of LED strings. However, in this creation, the use of full-wave rectification and the use of at least one transformer have "non-constant current" and "cost comparison". The disadvantage of "high"; in summary, the driver The circuit of the light-emitting diode still needs to improve the lack of "non-constant current (fluctuating current)" and "high cost".

In view of the above-mentioned conventional differences, the purpose of the present invention is to provide a light-emitting diode driving circuit that uses lower components to achieve lower cost and constant current operating characteristics.

The invention relates to a light-emitting diode driving structure, which is obtained by driving an input power and converting it into a constant current driving power to drive a plurality of light-emitting diodes, including a plurality of parallel diode groups and connecting the two ends of the diode group. a first piezoelectric conversion unit and a second piezoelectric conversion unit, wherein the first piezoelectric conversion unit and the second piezoelectric conversion unit obtain the input power, and then convert the input power in an opposite timing to form a driving power output stream Passing through the diode group, at least one of the plurality of diode groups in the plurality of diode groups is composed of a plurality of light-emitting diodes, and the first piezoelectric conversion unit and the second piezoelectric conversion unit have A piezoelectric transducer can easily achieve the advantages of impedance matching and constant current operation by using a piezoelectric effect, and a driving current capable of generating a constant current can illuminate a light emitting diode thereof through the diode group, and the above structure is supplied to The power of the diode group is the sum of the outputs of the first piezoelectric conversion unit and the second piezoelectric conversion unit, and the low-cost small power converter can be used to replace the larger single converter. In order to achieve cost savings effect.

The detailed description and the technical content of the present invention are as follows: Referring to FIG. 1 , which is a block diagram of a basic architecture of the present invention, the present invention is a light-emitting diode driving architecture, which is a power source. 1 obtaining an input power to generate a constant current driving power to drive a plurality of light emitting diodes 41 (shown in FIGS. 2 to 4), wherein the driving structure includes a plurality of parallel diode groups 4 connected to the second One of the two ends of the polar body group 4, the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3, and the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3 each have at least one piezoelectric transducer. Taking advantage of the piezoelectric effect to provide a constant current driving power, at least one of the plurality of diode groups 4 in the plurality of diode groups 4 is composed of a plurality of light-emitting diodes 41, and the first piezoelectric conversion The unit 2 and the second piezoelectric conversion unit 3 are connected to a control unit 5, and the control unit 5 respectively generates two control signals of opposite phases to drive the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3, so that the first a piezoelectric conversion unit 2 and a second piezoelectric conversion sheet After the input power is obtained by the element 3, the input power is converted by operating in the opposite timing. The driving power output drives the diode group 4, and the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3 operate in opposite phases to form a push-pull circuit structure, so that the first piezoelectric conversion The driving power power between the unit 2 and the second piezoelectric conversion unit 3 is the sum of the output powers of the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3, and thus when the first piezoelectric conversion unit 2 When the piezoelectric transformer having the same output specification as the second piezoelectric conversion unit 3 has twice the power of the single first piezoelectric conversion unit 2 (or the second piezoelectric conversion unit 3), The use of two lower cost piezoelectric transducers instead of a single transformer saves cost, and the piezoelectric effect can make the architecture disclosed by the present invention have the advantages of high efficiency, low electromagnetic noise, and low waste heat generation.

Referring to FIG. 2, the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3 provide DC driving power at opposite timings to drive the plurality of diode groups 4, and the driving power is in the same cycle. A DC current having a positive and a negative half cycle is used to drive the parallel and oppositely directed plurality of diode groups 4, and in the embodiment of FIG. 2, each of the diode groups 4 is a plurality of LEDs 41 connected in series, in this embodiment In the two diode group 4, one diode group 4 is opposite in direction and is connected in parallel with the other diode group 4. Therefore, the positive half cycle and the negative half cycle of the driving power cause the two diode groups 4 to be staggered. However, the frequency of the driving power is higher than the visual persistence of the human eye, so that the effect of the simultaneous opening of the two-pole group 4 can be felt; referring to FIG. 3, the above-mentioned plural diode group 4 can also be more The LEDs 41 having the same conduction direction and the diodes 42 connected in parallel to the LEDs 41 in the opposite direction, and the LEDs 41 in this embodiment are not limited to being connected in series, or a combination of a plurality of LEDs 41 having the same conduction direction in series and parallel; see FIG. 4 again, The body group 4 can be a series combination of a plurality of parallel diodes 42 and the light-emitting diodes 41, that is, a diode 42 is connected in parallel with each of the light-emitting diodes 41, and the diode 42 is The LEDs 41 have opposite conduction directions, and each of the diode groups 4 may have a plurality of LEDs 41 connected in series; the plurality of diode groups 4 may be provided by the plurality of embodiments to emit the LEDs 41 or The plurality of diodes 42 are combined in series and parallel, and the positive and negative half cycles of the driving power can be smoothly passed through the light-emitting diode 41 or the diode 42 having the opposite conducting directions to avoid damage to the diode group 4.

Please refer to FIG. 5, which is a block diagram of a preferred implementation architecture of the present invention. The basic architecture shown in FIG. 1 is the same as that of FIG. 1. However, the control unit 5 shown in FIG. 5 is connected to the diode. The thermal protection unit 6 at both ends of the group 4, the thermal protection unit 6 is determined according to the temperature of the diode group 4 Determining an overheat protection signal causes the control unit 5 to stop operating to achieve the effect of overheat protection; further, as shown in FIG. 5, the diode group 4 is connected in series with an inductor 7 to modify the waveform of the driving power. The waveform of the driving power is closer to a square wave to increase the efficiency of driving the diode group 4, and the floating of the current is reduced to shorten the critical conduction time of the diode group 4.

The first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3 can also operate at the same timing, and the first piezoelectric conversion unit 2 and the second piezoelectric conversion unit 3 have opposite polarities. The diode group 4 is connected to drive the diode group 4 to form an opposite output timing output.

While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and any modifications and modifications may be made without departing from the spirit and scope of the invention. In the present invention, the scope of the present invention is therefore defined by the scope of the appended claims.

In summary, the conventional circuit of the present invention enhances the above-mentioned effects, and should fully comply with the novelty and progressive statutory innovation patent requirements, and submit an application according to law, and invites your office to approve the invention patent application, to encourage creation, to Feeling the virtues.

1‧‧‧Power source

2‧‧‧First Piezoelectric Conversion Unit

3‧‧‧Second Piezoelectric Conversion Unit

4‧‧‧dipolar group

41‧‧‧Lighting diode

42‧‧‧ diode

5‧‧‧Control unit

6‧‧‧ Thermal protection unit

7‧‧‧Inductors

1 is a block diagram of the basic architecture of the present invention.

2 is a view (I) of an embodiment of a diode group of the present invention.

3 is a diagram (2) of an embodiment of a diode group of the present invention.

4 is a view (3) of an embodiment of a diode group of the present invention.

Figure 5 is a block diagram of a preferred embodiment of the present invention.

1‧‧‧Power source

2‧‧‧First Piezoelectric Conversion Unit

3‧‧‧Second Piezoelectric Conversion Unit

4‧‧‧dipolar group

5‧‧‧Control unit

6‧‧‧ Thermal protection unit

7‧‧‧Inductors

Claims (10)

A light-emitting diode driving structure is configured to obtain a driving current of a constant current to drive a plurality of light-emitting diodes, wherein the driving structure comprises: a parallel plurality of diode groups, wherein at least one of the diode groups The first piezoelectric conversion unit and the second piezoelectric conversion unit are both connected to the first piezoelectric conversion unit and the second piezoelectric conversion unit. The input power, and the input power is converted at the opposite timing to form a drive power output flowing through the set of diodes. The illuminating diode drive structure of claim 1, wherein the first piezoelectric conversion unit and the second piezoelectric conversion unit each have at least one piezoelectric transducer to provide a constant current driving power. The illuminating diode driving structure according to claim 1, wherein the plurality of diode groups are at least two conducting groups having opposite conduction directions and parallel to each other. The illuminating diode driving structure according to claim 3, wherein each of the diode groups is a plurality of LEDs in series. The illuminating diode driving structure of claim 3, wherein each of the diode groups is a series combination of a plurality of parallel diodes and a light emitting diode, and the diode and the illuminating diode The conduction direction of the polar body is opposite. The illuminating diode driving structure of claim 1, wherein the plurality of diode groups are a plurality of light emitting diodes having the same conducting direction, and the conducting direction is opposite to the light emitting diodes. Diode. The LED driving structure of claim 4, 5 or 6, wherein the diode group is connected in series with an inductor to modify the waveform of the driving power. The illuminating diode driving structure of claim 1, wherein the driving structure further comprises a control unit generating a phase opposite control signal to drive the first piezoelectric conversion unit and the second piezoelectric conversion unit to The working sequence works. The illuminating diode drive structure of claim 1, wherein the driving structure further comprises a control unit for generating a control signal for driving the first piezoelectric conversion unit and the second piezoelectric conversion unit, and the a piezoelectric conversion unit and the second piezoelectric conversion unit and the diode group The polarity of the connections is reversed to produce drive power with the opposite output timing. The illuminating diode driving structure of the eighth or the ninth aspect of the invention, wherein the control unit is connected to a thermal protection unit that is connected across the two ends of the diode group, and the thermal protection unit is based on the second The temperature of the polar group determines an overheat protection signal that stops the control unit from operating.